I use the same set and feel them adequate for Tachihara (~4 lb), but I wouldn't use them for a camera twice the weight and longer bellows. If the head has QR, the small plate for 3030 is...quite small.
While I'm quite stingy about weight (and $$$), I also recommend the "max load of twice what's on it" rule. Not enough tripod can be worse than no tripod.
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